html,body{
  height: 100%;
}
.clear::after{
  content: "";
  display: block;
  clear: both;
}
#content .active{
  background-color:pink;
  color: white;
}
*{
  padding: 0;
  margin: 0;
}
#nav{
  width: 100%;
  height: 60px;
  line-height: 60px;
  text-align: center;
  background-color: goldenrod;
  position: relative;
}
#loginout{
  position: absolute;
  right: 20px;
  top: 0;
}

#content{
  width: 100%;
  /* css的calc()函数 可以用来计算一个值 符号 + - * /  符号两边必须有空格 */
  height: calc(100% - 60px);
  background-color: gray;
}
#content>aside{
  width: 15%;
  height: 100%;
  background-color:rgb(121, 126, 197);
  float: left;
}
#content>aside li{
  list-style: none;
  text-align: center;
  width: 100%;
  /* border: 1px solid green; */
  padding: 15px 0;
  cursor: pointer;
  background-color:rgb(121, 126, 197);
  color: aquamarine;
}
#content>aside li:hover{
  background-color:pink;
  color: white;
}
#zuyuan1{
  background-color: #fff;
}
#zuzhang div{
  color: red;
}